Charles h



(No Model.)

- VG.H.AYARS.

VISE. 7 No. 499,494. i Patented June 13,1893.

.9 7 WITNEESE S INVEN'I'UR- @LDLYMkmW. 711,4 1 q MUM I a mus PETERS copumoumo" WASHINGTON u c UNITED STATES PATENT- OFF CE.

CHARLES H. AYARS, OF HAVRE DE GRACE, MARYLAND.

VISE.

SPECIFICATION forming part of Letters Patent No. 499,494, dated June 13,1893.

Application filed February 17, 1893. Serial No. 462,678- (NomodeL) .Toall whom it may concern:

following is a specification.

on pivots, g.

My'invention relates to an improvement in Vises, and has for itsobject'to provide a device in which the movable jaw may be readilyadjusted to or from the fixed jaw, without the necessity of running thelength of the screw to obtain the desired position.

The invention is illustrated in the accompanying drawings in which-Figure 1, is a longitudinal, vertical section through my improved vise.Fig. 2, is a detail of the pawl, D, bearing the half-nut. Fig. 3, is adetail of the bell-crank lever, F. Fig. 4, is a detail of lugs orprojections, I.

The letter, A, designates the movable jaw of the vise; B, the stationaryjaw; O, a stationary guide located within the casing, B, which formspart of the stationary jaw, B, and through which the screw, E, passes;D, a pawl bearing the half nut, cl, and having pivot bearings, d,journaled in the socket, 0, formed by the lugs or projections, I, insideand on the bottom of the casing, B. A spring, 0, is secured at one endto a bar, 6, which connects the projections, I, and at the other, to aneye in the boss, diupon the pawl, D. The function of this spring is tokeep the pivot bearings, (1, always within the socket, O, and

to hold the screw-threads of the half-nut, d, in normal engagement withthe thread upon the screw, E. Treadles, F, and, G, are fulcrumed at oneend to lugs, f upon the floor. The connecting rod, F, is hinged at itslower end to the treadle, F, and at its upper end, is pivoted at, f, tothe pawl, D. A compression spring, f, is on this connecting rod, andlocated in a recess, 22, in the casing, B, and is designed to assist inkeeping the pawl, D, normally in engagement with the screw, E, and toreturn it to engagement therewith after it has been withdrawn by thetreadle, F. A bell-crank lever is pivoted in a recess, X, in the bottomof the casing, B, and oscillates A connecting rod, G, is pivoted at itsupper end to the horizontal arm, g, of the bell-crank lever, and at itslower end, is hinged to the treadle, G. The end of the vertical arm, 9of the bell-crank lever is rounded and takes into acorresponding recess,gfl-in the pawl, D. c

The operation of the vise is as follows :-By means of the treadle, F,the pawl, D, is depressed, and the threads upon its half-nut, d, arewithdrawn from engagement with those upon the screw, E, whereupon themovable j aw, A, may he slid to any desired position without the screwbeing turned. On

releasing the treadle, F, the half-nut on the pawl will re-engage withthe threads of the screw, E, and the jaw, A, may then be moved to orfrom the jaw, B, by the means of screw, E. When an object is to beclamped in the vise, the treadle, F, is depressed, allowing the movablejaw to slide up till it touches; the treadle, F, is released, allowingthe pawl to engage the screw, and then the treadle, G, is depressed,which causes the vertical arm of the bell crank lever, to move the vpawlfrom its socket and toward the guide, 0, and since the pawl is inengagement with the screw which carries the movable jaw, will cause saidmovable jaw to slide toward the fixed jaw and bind against the object tobe clamped, whereupon the operator may have a free use of his hands, toturn the screw, &c. Work-supporting-blocks, n, are loosely disposed inrecesses, m, in the jaws of the vise; they are supported on the edges,71/, eccentrically with respect to the center of gravity of the block,so that the tendency of said blocks is to fall forward from therecesses, but they are retained in their normal position shown, by alug, n upon the supporting blocks, co-acting with a corresponding lug,m, within the recesses, m. The function of these loose blocks is to actas a bottom-support for any object clamped in the jaws of the vise, toprevent such object from slipping down between the jaws. They are to beused when the object or pieceof work is small enough to be clampedbetween the jaws, above the top of said blocks. When larger objects areclamped, the supporting blocks will be pushed entirely within theirrecesses and the jaws present flat surfaces. If desired, the supportingblocks may be withdrawn from their recesses, and the vise used withoutthem.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In avise the combination of a fixed jaw; a slidingjaw; a screw affixed to said sliding jaw and movable therewith; a pawlpivoted in the stationary jaw and bearing a half-nut adapted to engagesaid screw; a spring for retaining said pawl in normal engagement withsaid screw; means for withdrawing the half-nut from engagement with thescrew; a bell-crank lever pivoted to the stationary j aw and having oneof its arms engaging a recess in the pawl; and means for operating saidbell-crank lever, substantially as described.

2. In a vise the combination of a stationary jaw: a sliding jaw; a screwjournaled in said sliding-jaw and movable therewith; a stationary guidefor the screw secured in the casing through which the screw passesloosely; a pawl pivoted in bearings on theeasing, and having a half-nutfor engaging the screw; a spring connected at one end to the lugs and atthe other to the pawl; a depresslble rod connected to the pawl forwithdrawing the half-nut from engagement with the screw; a compressionspring, f on the depressible rod, co-acting with the half-nut on thepawl; a bell-crank lever pivoted in the casing, and having one armengaging in a recess 1n the said pawl, and a depressible rod pivoted tothe other end of said bell-crank lever for opcrating the same, asdescribed.

In testimony whereof I affix my signature in the presence of twowitnesses.

CHARLES II. AYARS. Witnesses:

DAVID M. AYARS, J. W. FOSTER.

